diff --git a/client/api_client.go b/client/api_client.go
index 01fca048..5200fba4 100644
--- a/client/api_client.go
+++ b/client/api_client.go
@@ -7,8 +7,9 @@ import (
 )
 
 type ApiClient struct {
-	http                 http.HttpClientInterface
-	cachedOrganizationId string
+	http                  http.HttpClientInterface
+	cachedOrganizationId  string
+	defaultOrganizationId string
 }
 
 type ApiClientInterface interface {
@@ -117,9 +118,10 @@ type ApiClientInterface interface {
 	CustomFlowGetAssignments(assignments []CustomFlowAssignment) ([]CustomFlowAssignment, error)
 }
 
-func NewApiClient(client http.HttpClientInterface) ApiClientInterface {
+func NewApiClient(client http.HttpClientInterface, defaultOrganizationId string) ApiClientInterface {
 	return &ApiClient{
-		http:                 client,
-		cachedOrganizationId: "",
+		http:                  client,
+		cachedOrganizationId:  "",
+		defaultOrganizationId: defaultOrganizationId,
 	}
 }
diff --git a/client/client_test.go b/client/client_test.go
index 3898a112..4b818892 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -13,7 +13,8 @@ import (
 // This file wraps the test suite for the entire client folder
 
 const (
-	organizationId = "organization0"
+	organizationId        = "organization0"
+	defaultOrganizationId = "organization1"
 )
 
 var (
@@ -31,7 +32,7 @@ var _ = BeforeSuite(func() {
 
 var _ = BeforeEach(func() {
 	mockHttpClient = http.NewMockHttpClientInterface(ctrl)
-	apiClient = NewApiClient(mockHttpClient)
+	apiClient = NewApiClient(mockHttpClient, defaultOrganizationId)
 })
 
 var _ = AfterSuite(func() {
diff --git a/client/notification_test.go b/client/notification_test.go
index 9762b013..b7659e78 100644
--- a/client/notification_test.go
+++ b/client/notification_test.go
@@ -1,8 +1,6 @@
 package client_test
 
 import (
-	"errors"
-
 	. "github.com/env0/terraform-provider-env0/client"
 	gomock "github.com/golang/mock/gomock"
 	"github.com/jinzhu/copier"
@@ -87,29 +85,6 @@ var _ = Describe("Notification Client", func() {
 				Expect(*createdNotification).To(Equal(mockNotification))
 			})
 		})
-
-		// NotificationCreate calls "organizationId()""
-		// The test was "randomly" added here to test organizationId failure (when there are multiple organizations).
-		// Ideally should be tested in organization. Unfortunatly, organizationId is private and cannot be tested directly.
-		// (test package name varies from package name).
-		Describe("Failure - Multiple Organizations", func() {
-			var err error
-
-			BeforeEach(func() {
-				organizationsResult := []Organization{{}, {}}
-				mockHttpClient.EXPECT().
-					Get("/organizations", nil, gomock.Any()).
-					Do(func(path string, request interface{}, response *[]Organization) {
-						*response = organizationsResult
-					})
-				_, err = apiClient.NotificationCreate(NotificationCreatePayload{})
-
-			})
-
-			It("Should return error", func() {
-				Expect(err).To(BeEquivalentTo(errors.New("server responded with too many organizations")))
-			})
-		})
 	})
 
 	Describe("NotificationDelete", func() {
diff --git a/client/organization.go b/client/organization.go
index a190ae8c..4327b9f3 100644
--- a/client/organization.go
+++ b/client/organization.go
@@ -2,6 +2,7 @@ package client
 
 import (
 	"errors"
+	"fmt"
 )
 
 type Organization struct {
@@ -36,7 +37,17 @@ func (client *ApiClient) Organization() (Organization, error) {
 		return Organization{}, err
 	}
 	if len(result) != 1 {
-		return Organization{}, errors.New("server responded with too many organizations")
+		if client.defaultOrganizationId != "" {
+			for _, organization := range result {
+				if organization.Id == client.defaultOrganizationId {
+					return organization, nil
+				}
+			}
+
+			return Organization{}, fmt.Errorf("the api key is not assigned to organization id: %s", client.defaultOrganizationId)
+		}
+
+		return Organization{}, errors.New("server responded with too many organizations (set a default organization id in the provider settings)")
 	}
 	return result[0], nil
 }
diff --git a/client/organization_test.go b/client/organization_test.go
index fc3c29c0..b60f6185 100644
--- a/client/organization_test.go
+++ b/client/organization_test.go
@@ -15,6 +15,11 @@ var _ = Describe("Organization", func() {
 		Name: "env0 🦄",
 	}
 
+	mockDefaultOrganization := Organization{
+		Id:   defaultOrganizationId,
+		Name: "default",
+	}
+
 	Describe("Organization", func() {
 		var organization Organization
 		var err error
@@ -41,6 +46,28 @@ var _ = Describe("Organization", func() {
 			})
 		})
 
+		Describe("Default Organization", func() {
+			BeforeEach(func() {
+				organizationsResult := []Organization{mockOrganization, mockDefaultOrganization}
+				httpCall = mockHttpClient.EXPECT().
+					Get("/organizations", nil, gomock.Any()).
+					Do(func(path string, request interface{}, response *[]Organization) {
+						*response = organizationsResult
+					})
+
+				organization, err = apiClient.Organization()
+			})
+
+			It("Should send GET request once", func() {
+				httpCall.Times(1)
+			})
+
+			It("Should return organization", func() {
+				Expect(organization).Should(Equal(mockDefaultOrganization))
+				Expect(err).Should(BeNil())
+			})
+		})
+
 		Describe("Failure", func() {
 			It("On error from server return the error", func() {
 				expectedErr := errors.New("some error")
@@ -62,7 +89,7 @@ var _ = Describe("Organization", func() {
 
 				_, err = apiClient.Organization()
 				Expect(err).ShouldNot(BeNil())
-				Expect(err.Error()).Should(Equal("server responded with too many organizations"))
+				Expect(err.Error()).Should(Equal("the api key is not assigned to organization id: " + defaultOrganizationId))
 			})
 		})
 	})
diff --git a/env0/provider.go b/env0/provider.go
index 30e3bfec..aa46c2c7 100644
--- a/env0/provider.go
+++ b/env0/provider.go
@@ -49,6 +49,11 @@ func Provider(version string) plugin.ProviderFunc {
 					Required:    true,
 					Sensitive:   true,
 				},
+				"organization_id": {
+					Type:        schema.TypeString,
+					Description: "when the API key is associated with multiple organizations, this field is required. If an API key has one organization, this field is ignored.",
+					Optional:    true,
+				},
 			},
 			DataSourcesMap: map[string]*schema.Resource{
 				"env0_organization":              dataOrganization(),
@@ -174,7 +179,7 @@ func configureProvider(version string, p *schema.Provider) schema.ConfigureConte
 			return nil, diag.Diagnostics{diag.Diagnostic{Severity: diag.Error, Summary: err.Error()}}
 		}
 
-		apiClient := client.NewApiClient(httpClient)
+		apiClient := client.NewApiClient(httpClient, d.Get("organization_id").(string))
 
 		// organizations fetched to cache Auth0 API response.
 		if _, err := apiClient.OrganizationId(); err != nil {